OF THE CRYSTALLINE LENS AFTER DEATH. 
257 
In the lens of another horse, whose age was also unknown to me, the remains of 
three structures were visible ; but the two positive ones, namely, the central and ex- 
ternal structures, had just disappeared, but were not encroached upon by the inter- 
mediate negative one. They were therefore black when seen by polarized light, as 
shown in fig. 7, while the remaining negative one was of the most brilliant yellow 
colour. 
In the lenses of a third horse, probably of an intermediate age, I found a structure 
intermediate between that of the two preceding ones. The following were the di- 
mensions of its lenses. 
First Lens. Second Lens, 
inch. inch. 
Longest diameter .... . 0*827 0*820 
Shortest diameter 0793 0 793 
Thickness Not measured 0*500 
The first lens having been carefully prepared and immersed in distilled water, ex- 
hibited the beautiful optical figure which is but imperfectly represented in fig. 8. 
The central sectors were positive, but faintly illuminated. The wide and brilliant 
yellow and white structure was negative, and the external structure, which had just 
begun to appear, was positive. 
On the second day the black mass round the central sectors had enlarged itself, 
and become very black, having the form of a square lozenge. The yellow ring has 
risen in its tint to a brilliant pink yellow at the edges, the white ring within it having 
increased in width, and the white ring without it having diminished. 
On the third day the diameter of the lens had increased to 0*86 in all directions, 
and its thickness from 0*50 to 0*717 of an inch. The coloured ring has not changed 
greatly. 
On the fourth day the bright pink of the negative structure has risen to a bright 
blue, the pink and yellow being seen at its margin ; and the external positive struc- 
ture seems to be now conjoined with the blue negative structure, in consequence, no 
doubt, of the extension of the latter to the margin of the lens. The thickness of the 
lens was now upwards of 0*86, and the capsule came off', in consequence of which 
two of the blue sectors have become of a pale pink colour. The instant the capsule 
came off the lens shrunk in all its dimensions nearly the tenth of an inch. 
The second lens on the third day gave exactly the optical figure shown in fig. 8, 
having been newly placed in distilled water ; but the external ring seems to be slightly 
negative, like the yellow one. Its appearance was greyish and indistinct. 
On the fourth day the yellow ring had risen to a pale pink of the first order, and 
the outer ring was negative, as on the preceding day. 
On th e fifth day the pink ring had increased in intensity, and the other structures 
remained the same as before. 
On the sixth day the pink had risen to a very bright blue. The diameter of the 
